PA-060 Heatsink

Hey Bob...Do you see any merit in Strapping one of these to the back of a PA-060? I've done it, and it got Warm...Fast...And now it's 65 Deg. in here, but the PT is just warm to the touch at 2:00 on the Marantz 7T...It seems like a good idea to me..

Thats awesome. Ill have to give that a try. my PT has been getting very hot as well. I put a radioshack fan on top of it. it cools it down but I'm not thrilled with the white noise it generates. the PT on my MK3 also gets hot and stays hot after I turn it off.

Nearly all the original Dynaco PA-060 power transformers run hot. They only had a 1 1/2 to 1 5/8" stack. With limited iron, there was wasn't much metal in there to act as a heat sink to keep the transformer cool. NEW PA-060 upgraded replacement power transformers for the ST-70 all have a much higher stack, usually in the neighborhood of 2 to 2 1/2 inches. These will all run noticeably cooler than the stock power transformer. You won't need a "separate heat sink cooler" with any one of the upgraded PA-060 power transformers. The upgraded power transformers will also allow the use of 6550 and KT88 output tubes for a slightly different sound.

Sled108 wrote:Mmmm..Sounds like an Upgrade...Which 'New' PA-060's are you referring to Bob?

Sled,

You can get upgraded power transformers for the ST-70 from Triode Electronics or Dynakitparts. I tend to like the one from Dynakitparts a little better. It costs a little less and it has a bottom cover. The Triode upgraded power transformer for the ST-70 has no bottom cover. You can buy one as a $5 "option" but IMHO they should give you the bottom cover. Without a bottom cover the transformer will undoubtedly release more EMI (electromagnetic interference) to the amp's circuitry. This *could* result in a noisier amp.

Hey Bob..Well, the Weather has gotten warmer, and so has my PT...Now, I'm trying this...Am I the only One who does this? I'm on Audiokarma and DiyAudio, but I have yet to see this done by Anyone...It would seem to be a really Cheap and Easy thing to help with a Hot PT...It Really works for me, and my ST-70...Maybe when July rolls around, I'll 'Borrow' my Mom's Digital Cooking Thermometer, and measure the Real Effect of the HeatSinks...

Bob; Yeah, I'll do a Temp Test when it gets even Warmer around Here...Steve; Yes, I still have the One on the Back in Post 4...Quad; No, I've been trying to find Details on that Board for the last 25 yrs.

Well, here's the Latest...Which I'll be doing a Temp Test with...But, now I've also Felt that the Choke is Quite Hot, even with the Fins on It...Maybe I'll have to find a Little Bitty Piped Cooler for it too...

And, as You see It...Room Temp; 78 Deg...With an Old Fashion Candy Thermometer; 108 Deg. on the PT...At Moderate Listening Levels...Less then 12:00..

Sled108 wrote:Well, here's the Latest...Which I'll be doing a Temp Test with...But, now I've also Felt that the Choke is Quite Hot, even with the Fins on It...Maybe I'll have to find a Little Bitty Piped Cooler for it too...

And, as You see It...Room Temp; 78 Deg...With an Old Fashion Candy Thermometer; 108 Deg. on the PT...At Moderate Listening Levels...Less then 12:00..